Small-scale ARG (Alternate Reality Game) creators or "creepypasta" enthusiasts sometimes use clinical-sounding filenames to give their videos a "found footage" or mysterious feel, though no major "Mary" mystery is currently trending under this exact name. How to Open the File
This is the file format that "wraps" the video and audio data together so it can be played on most devices. Common Use Cases 264-Mary.mp4
Many CCTV and IP camera systems (like Frigate ) use H.264 compression and auto-generate filenames based on camera names and timestamps. AVC/H.264 и MP4 - Elecard
If you are using software like x264 to convert files, the output might be named after the codec used during the process. 264-Mary.mp4
Разница между MPEG-4, AVC/H.264 и MP4 - Elecard